GlobalWebIndex's Q3 2014 report on social networking trends highlights that Tumblr, Pinterest, and Instagram are rapidly growing platforms, with Facebook remaining the dominant network despite a decline in active usage among younger users. Mobile and tablet use for social networking is increasing, while multi-networking is on the rise, indicating diverse user engagement across different platforms. The report emphasizes that brands need to adapt their strategies to engage users across multiple networks rather than relying solely on Facebook.