You know what it's like: one day you go to check your emails and there it is – an old school mate has got in touch via Friends Reunited. Dumbfounded, you wonder what on earth they want after all this time? Your emotions stir as a mixture of panic, dread and intrigue take hold.

Given the predominance of social networking sites like Facebook, Bebo and the aforementioned, it's never been easier to track down long-lost buddies, old-flames, and the like. But how many of us have got in touch with such people, said we must meet up again soon, and then just left it at that? After all, what would you talk about? Do you still have anything in common? The pitfalls are numerous. But the rewards can be unexpectedly pleasant, too:

So, what we'd like to know this week is this:

• Do you have a heart-warming 'friends reunited' tale to share with us?

• Who would you consider to be your longest lost friend, and why?

• Did your friendship fizzle out, or was it ended by an argument?

• Or maybe your circumstances changed to such an extent that it was too difficult to keep your friendship going?

• Do you still think about that person?

• Have you been in a touch again, and, if so, how did it go?

• Maybe you are too nervous to get in touch?

• Are you happy to never see your longest lost friend again?

• Can friendships last forever?