Nah, it's not a forum. You can't raid Reddit, unfortunately. They have over 2,000,000 users and a voting system. Anything dumb we try to do actually gets shot down.
WAIT! There can be a sort of raid, and I will enjoy the hell out of it. So here is reddit.
reddit: the front page of the internet
As you can see, there are posts and comments. There is a voting system called karma. Upvotes are good. Downvotes are bad. The redditors care so much for these fucking internet points!

The posts I don't mind, but the comments are stupid, almost always. Now, most Redditors (as they aptly name themselves) have normal accounts. e.g. - I'm_a_Redditor
There are some Redditors that have what they call, "novelty accounts." e.g. - I_paint_your_comment. And that account usually paints a picture of the comment it replied to. Everybody loves accounts like that. They're like fucking kids laughing at peek-a-boo to accounts like those.
Now, there are other novelty accounts such as "Just_Repeats_You." I don't think I need to explain what that novelty account does. Everyone absolutely hates that account, and I love it because it makes everyone angry. People literally comment, "dude, I see you everywhere. Fucking stop!"
I love it!
Here's where the possibility of a raid kicks in. I told you about a voting system. We can never get by with posts, as they will just vote us down and it will never make the front page. But we can get by with comments! We could create an account called, say, Internet_Tough_Guy1 and 2 and we could comment on the top comment and call them names. We would get downvoted to hell but because we commented on the top comment, they can't hide us! Can ya think of other novelties?
Additional information - There have recently been a whole army of accounts that post pictures of buttholes saying "Don't click the picture below. It's a picture of my Butthole! Tee hee!" Redditors hate that the most, but unfortunately, that will get us a quick ban ticket.