Table 1.

Advertising source data

Recruitment source	Facebook	Growlr	Hornet	Grindr	Free/organic	Total
Number of campaigns	3	1	2	5	2	13
Advert clicks	1210	1193	Not available	6666	Not available	Not available
Registered & eligible	216	120	590	406	38	1370
Registered & ineligible	32	19	109	144	9	313
Click conversion1	20%	12%	Not available	8%	Not available	Not available
Randomised	173	96	433	308	27	1035
Registration conversion2	80%	80%	73%	76%	71%	76%
Spend per randomisation	£3.70	£2.59	£1.66	£7.16	£0.00	£3.68

¹Click conversion: proportion of clicks leading to a registration

²Registration conversion: proportion of eligible registrations leading to a randomisation