Can I tag people or pages in my posts?

For Twitter, you can insert a username into your post by entering it like this: @username 

You'll need to know the Twitter username you wish to tag first though as, when you type the "@" symbol into the post text box, matching usernames do not appear for you to select.

To tag a Facebook page in your posts (currently, you can't tag people), the tag has to be entered like this: @pageid

You can find the ID of any Facebook Page by following these steps.