Hello hello,
I have a quick question to ask you.
Do you know if we are obliged to use the official signin button for each media?
In fact I am using basics ionic buttons with the icon of the social network.
Regards
You can only answer that by reading the TOS or terms you agreed to when joining the developer programs of the network you are using.
In general people tend to use whatever they want. Users although hate it when they don’t recognize what they are logging in to.