FaCIAbook

The story

1. Proto-Indo-European*dʰeh₁-
2. Proto-Indo-European*dʰeh₁k-
3. Proto-Indo-European*dʰh₁kyéti
4. Proto-Italic*θakjō
5. Proto-Italic*fakjō
6. Latinfaciō
7. Latinfaciēs
8. Late Latinfacia
9. Old Frenchface
10. Middle Englishface
11. Englishface
12. Proto-Indo-European*bʰeh₂ǵosder.?
13. Proto-Indo-European*bʰeh₂g-der.?
14. Proto-Germanic*bōks
15. Proto-West Germanic*bōk
16. Old Englishbōc
17. Middle Englishbok
18. Englishbook
19. Englishnamebookinflu.
20. Englishfacebook
21. EnglishFacebook
22. Proto-Indo-European*ḱen-?
23. Proto-Indo-European*ḱéntrom
24. Proto-Hellenic*kéntron
25. Ancient Greekκέντρον (kéntron)
26. Latincentrum
27. Proto-Indo-European*h₂el-
28. Proto-Indo-European*h₂élisder.?
29. Latincentrālis
30. Englishcentral
31. Proto-Indo-European*h₁én
32. Proto-Indo-European*h₁n̥tér
33. Proto-Italic*n̥ter
34. Latininter
35. Latininter-
36. Proto-Indo-European*leǵ-
37. Proto-Indo-European*léǵeti
38. Proto-Italic*legō
39. Latinlegō?
40. Proto-Indo-European*h₂leg-
41. Proto-Indo-European*h₂légeti
42. Proto-Italic*legō?
43. Latinintellegō
44. Latinintellegēns
45. Latinintellegentia
46. Old Frenchintelligence
47. Middle Englishintelligence
48. Englishintelligence
49. Proto-Indo-European*h₂eǵ-
50. Proto-Indo-European*h₂éǵeti
51. Proto-Italic*agō
52. Latinagō
53. Latinagēns
54. Medieval Latinagēntia
55. Englishagency
56. EnglishCentral Intelligence Agencyinit.
57. EnglishCIA
58. English todayFaCIAbook

Blend of Facebook + CIA, suggesting that the site has an ulterior motive of spying on its users, or is a tool of the US government.