Answer:
specialized purposes
Explanation:
There are numerous social network. Each serves a different purpose and people visit these site to satiate their different social needs.
Now marketing is used to increase brand recognition and brand loyalty. They needs to increase conversion rate from network campaign hence it becomes important to know on which social network their campaign will yield better result. Hence defining dimension for each social network becomes important
For example for any certification providing site like course era , marketing campaign on linked in will be more fruitful as the people there are in job and they look for resources which can enhance their skill