Apple iphone 3g, should i get it?

So I've never had an iphone and I've recently been looking into getting one. I plan on getting into a non contract plan, and I was considering the iphone 3g because I don't have much money. Most places that I'm seeing it are selling it for around the 100 dollar area which is in my budget. (yay!)

What I'm really needing to know is about the apps that the iphone 3g can get. Will I be able to use twitter, vine, snapchat, kik or skype on the iphone 3g? I feel like I may be asking a silly question but I always hear about apple updates this and that and I'm not exaclty fluent in the Mac/Apple language since I've only ever owned Toshiba's and only ever used Android cell phones.

Help a girl out!

p.s. I can't afford the 4 or 5, they are just a bit out of my realm at the moment. Lets only talk about the 3G please!

Added (1). Connor, I do shop online. I don't go outside very much.lol

Added (2). scott, could you please explain what makes it outdated?

$100 Dollar? That's like £60 over here in the uk. Afew shops sell 4s's for around £80 (not brand new) Why don't you order one online? But yeah, a 3G can get twitter and facebook etc. Just the same basically. Only one is newer.

The iPhone 3G was a good phone in its day but nowadays just too outdated (though not officially). Those apps very likely would not work, but you should be able to download the last working versions.

Hi! You just answered my question? I asked another one, basically adding on to it? Can you look at it please? I thought that this would be the only way of asking you this