This is the 841st most frequent Russian word.
соцсети
Social media.
Here, "соцсети" is used in the plural form, referring collectively to various social media platforms where the action of posting occurs.
Я часто выкладываю фотографии в соцсети.
I often post photos on social media.
"Соцсети" refers to social networks in a general sense, emphasizing their importance and role in communication.
Соцсети стали основным способом общения для многих людей.
Social media has become the main means of communication for many people.
Here, "соцсетей" is in the genitive plural form, indicating the context of being associated with these platforms.