Why was OAuth invented?

Question

OAuth

What was the main purpose of creating OAuth, so that the script could post tweets on behalf of the user without passing the username and password, logging in with what then?
This can help me somehow for automatic publications first on the website and then in various social networks. networks of the same content (news, events), or social networks do not approve of such behavior?

Answer 1

What was the main purpose of creating OAuth, so that the script could post tweets on behalf of the user without passing the username and password,

Yes.
in addition, the rights are set, to what exactly access is given to the application
a token that the site itself creates if the user in a separate window (in some cases belonging to the site, and not to the application, which also excludes the theft of cookies by the application) allows access to this application id
if it has an open API with oauth it may help, but this API may not be suitable