SOLVED: What is the Difference between a # (hashtag) and @ (at sign) in Twitter

Twitter uses the # (hashtag) to link to a topic where as the @ (at sign) to link to a person:P

• # = Topic – for example URTech knows more about #windows, #exchange and #Samsung #S3 than most other companies
• @ = Person – for example URTech is owned by @IanMatthews

You can combined these two in a single Tweet like  @IanMatthews at #urtech knows a lot about #projectmanagement