True.

Next person has 3 names.

Undefined. (In other words, your guess can't be pigenholed into a category of "correct" or "wrong".)

Next post is from a shared account (that is, one that more than one person uses).

You mean pigeonholed. Any possibility would be either right or wrong even if you didnt have a name or have more than 1 person writing the answer at the moment. Are you sure you mastered Mathematics cos you cant even handle X=3 logic. ;)

No, I never share any of my accounts with anyone.

Next person was driving bicycle last week.

Nope. Haven't owned one in about 30 years.

Next person will be alone for Valentine's Day

In a corporeal essence in most probability, not. In a deeper essence, in most probability, for once again, likely yes.

Next person will work out their frustration on Valentine's chocolates and chew them mercilessly until the box is empty!

Probably not, I don't generally receive or eat chocolate these days much as it tends to make me sick. If do like chocolate though so if I do get some I'll eat it and get sick. Not out of frustration over anything though.

Next person, like me - does not own a mobile phone and has no need, use or desire to own one. They get by just fine with an ordinary land line and Internet communications on a PC or laptop.

Certainly not me. In fact, I don't believe another such person even exists.

Next person's favorite color is somewhat unusual, such as teal, lilac or chartreuse.

Partly correct, because my favorite color is yellow and shades of it. So I like chartreuse yellow.

Next person has crush on anime characters.

Yessss...

Next person can cook for himself!

All the time. It's a requirement of being a bachelor; if I don't cook for myself, who will?

Next person plays at least two sports.

No... sports. I should but...

Next person has at least once helped in stopping/arresting a criminal (either by stopping the crime themselves, or being a witness).

No and i regret i didn't. One of they boys that was murdered lately as a scandal in a certain school of my country, happened to cross my way, one day, by chance, not two weeks before he went missing. I saw him crying and being dragged and bossed around by a very old, fat, ugly grandpa (i saw that figure on the news and he was a close relative) and even though it was one of the rare times i DIVINED that man was in danger, i shut up and kept walking. Sometimes i am angry with myself. I have sight, "power" or even belongings that are FAR above those of your average human, yet for some reason, i never appear to make any use of them, not even for the good of my own self...

Next person hates that stooge named George Sorros; especially his godawfully stupid lines, like "Russia is greater danger for europe than ISIS".

Looks like your sentence had a typo. Glad I was able to fix that for you. And yes, I do.

Next person speaks three or more languages.

I have studied Spanish and Japanese, but I don't regularly speak either, and my Japanese, in particular, is extremely limited.

Next person knows three or more programming languages.

Depends on "knows". I've coded in 8(+?) languages but many of them are quite a long time ago...

Next person loves strawberries.