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ⓘ - ( option to work with others at the same time ) This will let users work with other people at the same time if they are doing a collaboration.
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ⓘ - ( able to rate projects ) - REMOVED
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ⓘ - ( notifications ) As soon as we get a message or follow we should instantly get a message saying ‘You have been followed by ( username )’ or something similar to that.
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ⓘ - ( able to send private messages to st members ) I think this would be a really good idea so we are able to tell the ST members about any problems, bugs, issues with others, etc without everyone else being able to see.
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Please make separate topics for each suggestion. Also for the second one,

Rejected suggestions wrote:

4.2 Dislike button or a project rating system
This idea has a major drawback. Generally, a user's first project is something rather simple, such as a test project, a remix, or a project made using a tutorial. Because this project is simple, other users may give the project low ratings since it is not advanced. With low enough ratings, the creator might be discouraged enough to stop using Scratch, even though the creator is just trying to learn.

Moreover, constructive feedback is encouraged on Scratch. A dislike button may show the creator how many people disliked their project, but it tells nothing about what the creator could do better. If you do not like a project, you could choose not to love it, or you could leave a respectful and constructive comment telling the user how to improve.

this qualifies for any type of rating system.

1: Rejected
2: Also rejected
3: Umm…. We already do get notifications
4: You can just use contact us

--Explosion-- wrote:

1: Rejected
2: Also rejected
3: Umm…. We already do get notifications
4: You can just use contact us

This sums up my thoughts. Of course, we'd also like to see a separate topic for each suggestion.