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There's actually no difference between the two. You can use either of them or even both tags. :)

そうなの?違いがないのに2つのタグがあるの?

はい!そうです。Originally, #ulog is for a single post then if you have more than one post you use #ulogs, but people are using either or both. :)So, there isn't much of a difference anymore. ^^

あっ、1日に2回目の #ulogを書くときは #ulogs なの?

そうです!But people are mixing it up, so yeah.. it's okay to use both. :)

あはは(笑)このことは、この前の #ulogの日本語訳に書かなくて良いの?

I didn't include it because it didn't really matter... hihihi~

了解!そういうことなんだね。

Hihihi〜は、面白い英語だと思ってます。