No. It is impesonal, something like English "they say...". "I have been told that..."

There were few people talking to you. They told you. =Они говорили мне.

I would add that nouns and verbs differ in their endings based on gender (говорил/говорила) in Russian, thus limiting the gender of a person mentioned. But "кто-то говорил" is also used ("кто.." is always masculine).

No, it's because this form is totally unpersonified - you don't mention anyone directly (or even indirectly) who told you something, you just say that you heard some information from someone. It could be one person, a couple or a lot of people - totally not important. And because of that you use plural form like a sign that you don't want to give away any piece of information about your source of information - it's just someone somewhere in this vast universe, and it doesn't matter at all who is it.Russians use that construction when they don't want the person they talk to to know who told them that or aren't sure that it's a good idea to unravel their source of information.