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the need for “an algorithm that delivers the depth and breadth of the content we have on a specific topic and then eventually as it relates to people,” he added.

This is related to Twitter’s larger aim to better organize its content—to separate the interesting and timely tweets from the noise. Twitter has already begun tweaking the timeline where tweets appear—most notably (and controversially), by introducing tweets from accounts users haven’t chosen to follow.

Costolo said that the favorited tweets by other users show up when the user pulls to refresh their timelines twice and Twitter has no new content to show both times.

You can see tab engagement begin to decline on Feb. 28, the day brands were able to opt-in to Timeline. There’s a steeper leading into March 30, the day all Pages were forced to convert.

Why the general drop-off? PageLever founder Jeff Widman believes it’s a combination of two things: That brands can no longer set a custom tab as their default landing page for non-fans, and Tabs are less visible in the Timeline layout.

When you browse websites that have embedded a Twitter timeline, you can now interact with it in the same way you do on twitter.com. Expand Tweets to see photos, media, and more. Start a conversation from the Tweet box, follow users that you discover, and reply to, retweet, or favorite Tweets directly from the page.

ou will be able to follow more than 300 “topics” across sports, entertainment, and gaming, just as you are currently able to follow individual accounts. In return, you’ll see tweets from accounts that you don’t follow that have credibility on these subjects. Twitter executives hope that Topics will make the platform more approachable for new and intermittent users and make it easier for heavier users to discover new accounts and conversations. The feature, which began testing on Android in August, is set to roll out globally on November 13th.

When the TV show The X-Factor (U.K.) put a hashtag on the screen, it generated 27,000 tweets in 90 seconds.

Note that Twitter reported a half a billion tweets per day in October, up from 140 million per day in early 2011. It’s also a different way to measure its data than Twitter had in earlier years, when it would often tout the number of tweets, but really mean “items,” in terms of shares and re-shares which have to be shown on other peoples’ timelines.

witter is ramping up on big data visualization.

The rule does NOT apply to standard images you upload to your page, but only images you promote in the newsfeed Thumbnail images for videos or links that you promote in the newsfeed as ads are subject to the 20% rule As of this week, announced in a tiny update on Facebook’s Developer Blog, the rule applies to application icons (which includes timeline tab images too) ***UPDATE***: Facebook reps have indicated that the text rule does NOT apply to the thumbnail icons, but they still recommend using images with little to no text.

Product shots (i.e. real life photos of a product) do not count against the rule. This means name tags, stop signs, text on the actual product, etc. – that’s all good to go and does not count towards your 20% text allotment “Tune-in” images for TV shows or movies have leeway as the title of the show/feature, the tune-in info, and the names of the actors and actresses involved do NOT count towards the 20%

from the user’s perspective, one of the best parts about Actions is that you can use them without incessantly oversharing to your friends.

When you share a post or update your status on Facebook, it will appear in your friends’ news feeds. But when you have an Action coming from the Open Graph (i.e., from a site that exists outside Facebook but that uses Facebook Connect in some way), that activity will only appear in the Ticker and on your own Timeline.

Many Actions partners will offer granular settings to give you control over what you share. For example, design-centric flash-sale site Fab.com’s “Bought” actions are opt-in. Like the Actions turned on but don’t want to share a particular purchase with your friends? Mark it as a gift to hide it. Don’t worry about embarrassing buys; all Fab.com “adult” items are hidden by default.

Shazam execs' talk of using their proprietary data for advertising puts them in league with The Weather Company, Pandora and Amazon, which are all mining information like pollen count, song choices and product purchases to inform ad targeting. Mr. McGurn said the Shazam app ingests the live audio feed from 160 TV networks every day. That positions the app as an ally to TV networks trying to stem their share of ad spend from being siphoned online.

Shazam is also currying favor with TV networks as a way to drive viewership. For last fall's Country Music Association Awards, Shazam pushed alerts featuring the show's air date and time to the in-app news feeds of eight million users who might be interested in watching, like those who had previously tagged a Blake Shelton song. Ten million people received such a notification for The Grammys.

People who use Shazam to "tag" the game's broadcast this year will be shown a new Twitter-like timeline. The live content feed will document the game -- from tweets to photos to ads -- and is designed to keep people using Shazam for the duration. But even if people tune in and out of the app, Shazam has created a new ad-retargeting program that plugs into Facebook.