Algorithm 3. LocationHistoryInference
Input: TBHG=(H,G) and users’ location histories, LocH
Output: Users’ hub scores, S and locations’ authority scores, A.
1	S = A = ∅;
2	Fori = 1; i < |L|; i ++ //on each level
3	For j = 1; j < |C|; j ++ //on each cluster on the level
4	For k = i + 1; k ≦ |L|; k ++ //on each sub-level
5	C = LocationCollecting(k, c, H);
6	M = MatrixBuilding(C, LocH);
7	(x,y) = HITS-inference(M);
8	S = (x);
9	A = (y);
10	Return (S,A);