You can bookmark forum post, blog posts, wiki pages, and individual contributors.
In our old community, these were called 'Favourites'.
If you used this feature for bookmarking discussion threads and/or individual contributors... these will only have been carried over to this new community platform if more recent than 1 January 2013.
If you wish to bookmark a blog post you are reading, click the 'bookmark' icon at the top of the page, and then 'Bookmark this blog post'.