The week's news showed how Snapchat and WeChat have cemented their place in the ranks of big tech, investors told CNBC.

Snapchat was in the spotlight this week after it reportedly bought search and discovery app Vurb for over $100 million, according to technology news site The Information. Meanwhile Tencent, owner of Chinese messaging ecosystem WeChat, saw monthly active user accounts jump 34 percent year on year to 806 million.