Measure word and vocabulary for internet posts
Generally, you will say for " There are 100 xxx posts" as "有 100 个 yyy 帖子"

eg facebook posts = 脸书帖子
eg nytimes forum posts = nytimes 论坛帖子 etc 


when the messages generally look long, you can use "篇" as well, when the messages generally look short, you can use "条" as well.

when there is a special term for eg "tweets", you can use "推特帖子" or "推文"