I watched a video today on tTwitter. I watched a video today on Twitter.

"Twitter" has to be capitalized because it's a proper noun.

I watched a video today on tTwitter. I watched a video today on Twitter.

"Twitter" is the name of a company/service, and is hence a proper noun. It should be capitalised.

It's contents was, a women was having a board and stand in front of a car, and the board was written thatd "TOPLESS CARWASH." written on it. It's content was a women was having a board and stand in front of a car, and the board had "TOPLESS CARWASH" written on it.

It's contents was, a womean was havingith a board andwas standing in front of a car, and on the board it was written that "TOPLESS CARWASH.". Its content was, a woman with a board was standing in front of a car, and on the board it was written "TOPLESS CARWASH".

(1) "It's" is the contraction of "it is". "Its" is the possessive you're looking for. (2) It should be "content" and not "contents", because the content of videos is uncountable. (3) "Women" is plural, while "woman" is singular. (4) The period should be placed outside the quotation marks, unless it was also part of the text that was written on the board. (5) Overall, I made some adjustments to the sentence structure so that it sounds more natural. Do take some time to look over them.

The driver and other people in the car laughed hiysterically. The driver and other people in the car laughed hysterically.

The driver and (the) other people in the car laughed hiysterically. The driver and (the) other people in the car laughed hysterically.

A suggestion, just for your information: Instead of "other people", you can also write "other passengers".

I laughed too, while watching the video. I laughed too, while watching the video.

Anybody didn't lie, but I think it was so funny. Anybody didn't lie, but I think it was so funny.

AnyNobody didn't lied, but I thinkought it was so funny. Nobody lied, but I thought it was so funny.