Is there something wrong with my computer?

[711]

Idk if its my laptop (Acer) or maybe my Wi-Fi. I can't get on Twitter, Tumblr or Ask.fm & I can't open links my friends send me. (Not spam ones. Just YouTube videos or anything like that.) It did this for like 3 days. Twitter won't even let me post pictures. Twitter was fine all day today, but it started doing this again a few hours ago. I've ran virus scans on my laptop, restarted it & it still does this. Nobody else is talking about this happening, so I figure it's just me. I can only open Twitter through my email. I have to open a message that says someone has DM'd me & go in from there & it still barely loads.