Comma after "here"

Solution 1:

You are correct to use a comma, but, at the same time, a comma is not necessary. It is a matter of preference.

"Here" is your sentence is what's sometimes called a disjunct adverb, because it does not fit neatly within the flow of sentence (the italic neatly, on the other hand, does fit within the flow of the sentence, and is called an adjunct adverb). It modifies not a single verb or adjective, but an entire sentence. Very often, disjunct adverbs like yours are set off with a comma, so your use of a comma there is very common practice.

At the same time, many people believe that very short introductory adverbs or adverbial phrases do not require the comma:

With concise phrases, the comma may be omitted. You can as often see

Today I got married.

as

Today, I got married.

Deciding whether to use a comma or not can depend on what you want to emphasize--in this case, whether it's that you got married, which happened today, or what you did today, which is get married.

In your sentence, IMO, using the comma does add some emphasis to here, suggesting that on some other sites, you do not post what you like. But this is subtle, and the nuance may be lost on readers without more context. It is quite possible that some would assign this same meaning to your sentence even without the comma.

In short, this is a matter of personal style. If you have a real reason to include a comma, which seems to be the case, then include it.