Trinity Mirror has stepped up efforts to strengthen its position in online classified adverts by purchasing Workthing.com operator Hotgroup.
Print publishers are hoping to take the sting out of online competition
The Daily Mirror group paid £50.5m for the firm, a month after snapping up Financial Jobs Online for £10.45m.
Newspaper groups have been complaining of a downturn in advertising and buying online rivals enables them to take advantage of a potential competitor.
Johnston Press is one rival thought to have been targeting Hotgroup.
"We see exciting opportunities for the management and continued development of the Hotgroup alongside our existing recruitment advertising businesses and the acquisition is consistent with our strategy of growing Trinity Mirror's core classified franchises both on- and off-line," the publisher's chief executive, Sly Bailey, said.
Meanwhile Hotgroup said its "position of strength had clearly made it an attractive target to major players" in the industry.
The group will retain its current management structure and will be run as a separate company within Trinity Mirror.
The deal comes as UK newspaper advertising is suffering from low consumer confidence levels which are prompting companies to cut back on marketing - and as concerns mount about the health of the UK economy.
This week Johnston Press warned advertising revenues on a like-for-like basis had fallen 0.8% in the six months to 30 June from the same period last year, mainly because of a downturn in the employment category.
Such worries have sparked a rash of deals in the online classified sector, as job seekers increasingly log on to hunt for a new post.
Last week, Daily Mail & General Trust splashed out £4.1m to buy Zambeasy and Office Recruit, who control Top-Consultant.com and Officerecruit.co.uk.