Two US technology firms have announced they are creating 125 jobs in Dublin.

Internet advertising specialist Adroll is expanding its presence in Ireland and expects to hire 100 staff.

Adroll established its European headquarters in Dublin last year and announced plans to recruit 100 employees within 12 months.

By March it had increased that target to 120. It has now moved to new offices and announced its intention to hire 100 more staff bringing its total headcount here to 220.

Adroll specialises in ad retargeting and works with 15,000 advertisers worldwide.

Retargeting uses information online which retailers have collected on consumers to track them as they visit other websites and encourage them to return and make additional purchases.

The company said it was expanding its presence beyond its initial expectations in Ireland because of strong growth in demand for its services from advertisers.

Meanwhile, a Californian library technology company is to create 25 jobs by the end of next year, bringing its Dublin workforce to 50.

The expansion by Innovative is being supported by the Department of Jobs, through IDA Ireland.

The company's software is installed in various types of libraries including academic, public and school.

Taoiseach Enda Kenny said the jobs announcement is another vote of confidence in the country's strengths as a location for investment.