According to the Chapter $7$ Opening Case, the difference between Facebook's acquisition approach and the approaches of Microsoft and Google is that

Facebook tends to acquire earlier$-$stage companies, whereas Microsoft and Google tend to acquire later$-$stage companies.

none of Facebook's acquisitions have survived as independent comparvies, whereas those of Microsoft and Google have continued to operate as subsidiaries.

Facebook's approach is to acquire earlier$-$stage companies, whereas Microsoft and Google tend to acquire later$-$stage companies.

Microsoft's and Google's acquisitions have all been friendly, whereas Facebook's have all been hostile.