https://support.twitter.com/articles/49309
We used this site to see what Twitter recommends on using hashtags. Also it explains how many words are allowed in a tweet and what should go into a tweet.

http://mashable.com/2013/10/08/what-is-hashtag/#2eZOPYHS2uqJ
We were able to look through this site in order to define what a hashtag is, and what parts go into a hashtag. This site also showed us how to use hashtags in our professional working environments.

http://www.businessinsider.com/facebook-fired-2011-5
We used this when talking about what teachers should and shouldn't post on social media. We were able to show the class pictures and have them decide on whether they should have been fired or not. This brought up good discussion.

http://tweetchat.com
This website was good when finding popular hashtags. We also used this to understand the Twitter Chats and what they are used for. We learned about educational twitter chats and were able to explain them to the class.

http://teacherchallenge.edublogs.org/creating-a-pln/
I used this when getting information on how teachers can build their personal learning networks. It was a helpful website and had very good explanations.