I am looking to post about specific things not spam random urls and pictures.Nobody can ensure that the account will be able to post on groups, first of all, this kind of activity is outrated and prohibited, so the results are very small, also depends what kind of groups, usually people dont like to see cold links in the groups from unknown accounts, they only enjoy groups for chat and interaction, if you are not interacting with them and only post links, you are will be kicked out quickly.