BIFHSGO web site? They are the icons for BIFHSGO's presence on social media sites Facebook and Twitter.
Go ahead and try clicking on an icon. It won't bite!
f for Facebook gets you to a page which has news items added most days. 308 people, perhaps more now, likely genealogist friends, have clicked that they Like the site.
The little bird is for Twitter, the 140 character social network. Since July 2011 when BIFHSGO started on Twitter there have been 846 posts and 306 people follow it meaning that posts, mostly in association with monthly meetings and the annual conference, automatically appear in your Twitter feed.