Self-explanatory

3 Simopsis Holiday banners which are each up for 3 days.

3 pictures in the SM banner
3 days until christmas
3 "3" things in this post

3rd child of the family!

3 letters
AFK
BBL
TBH
etc.

and many many others

"Three" is the first name of my CJ... Troix (I just put x as a replacement of s)

Interestingly, the Simmania Counting Thread is currently sitting in 3 pieces.

There are 3 s's on Simopsis and 3 i's on simLink's signature picture... Also his avatar has the third alphabet, C

111222333444 has 3 threes in his username

meister1235 has a three
and if you write it in L33T then my username has even more,
then i has 3 3s
M3I5T3R1235

As of this post, Meister has 376 posts

and 111222333444 has 1839 posts. 9 is also 3+3+3 ... 3 3's!

3568 posts.
The year is 2013
1+1+1+2+2+2+3+3+3+4+4+4 = 30....

You just posted three things that are related to three.
Above is 9 words
3 * 3 = 9

That's 10 words

and above is 3 words

There are 3 a's on Cheese's post

3 e's on cheese and more than 3000 posts

Three people's choice awards for 111222333444, who's username contains 3 threes

Blake has awards for 3 years

Six words in 111222333444's post. 2 x 3 = 6

Simmania 3!

Yay!

Towncrafter's last 3 posts (as of now) in the Simmania counting thread say LOL

LOL also has 3 letters in it

The first word in this and the previous post has 3 letters