I'm finding them a pain too. I'm not on Facebook, Twitter, PinIt, G+1 or +Share (whatever they are). They cause the page to load slowly. The browser seems to have to repaint the page for each one. And if I start scrolling down the page to read the posts before the page has loaded properly they seem to cause my browser to crash. I've done a cold reset of the box (iPad mini with Safari browser) and I still get crashes. No crashes on any other sites.
Any add-ons any of you can suggest for Safari to block these things? I guess they'd have to be available from the Apple store.
Even better would be a setting to opt out from them in my BCUK profile as I'm not on those groups. Nor ever likely to join.